Wait, I thought he was just bullshitting his fans with that. He's actually serious? XD
Also, I don't understand what this has to do with bare metal construction of the Cybertruck and why that should present exceptional difficulties. DeLorean figured out how to make bare metal cars more than forty years ago, so it can't be that hard.
Your mistake was actually assuming that there is any discernible difference between a Musk statement he considers serious, and bullshit. They are the same.